LOS ANGELES (thefutoncritic.com) -- Just as the broadcast networks are prepping for their fall premieres, Sci Fi Channel is gearing up for the summer finales of its various original series.

It all begins on Friday, September 16 at 8:00/7:00c with the two-hour summer finale to "Stargate SG-1's" ninth season ("Prototype"/"The Fourth Horseman, Part 1"). The following week on September 23 at 8:00/7:00c look for spin-off "Stargate Atlantis's" two-hour summer swan song to its second season ("Aurora"/"The Lost Boys"). And that same night, "Battlestar Galactica" closes the first half of its sophomore season at 10:00/9:00c ("Pegasus").

Look for all three series to return in January for the latter half of their respective 20-episode seasons.

As for Sci Fi's Wednesday entries, "Master Blasters" (which was banished to the 11:00/10:00c slot last week) will close its inaugural run on September 28 while "Ghost Hunters" and "Tripping the Rift" will wrap their 13-episode seasons in October.